Remove dead code found by full Periphery audit; add scan config + advisory CI (#1410)

Periphery 3.7.4 audit of both schemes (macOS + iOS, intersected so
platform-specific code is never touched), with test targets indexed and
the share extension built. 277 dead declarations removed or demoted:
dead forwarding wrappers (ChatViewModel+Nostr/+PrivateChat), removed-
feature remnants (autocomplete command suggestions, back-swipe tuning,
MediaSendError, GeohashParticipantTracker), unused Tor dormancy
bindings, assign-only properties, unused parameters (renamed to _), and
redundant public accessibility. 13 orphaned localization keys deleted
across all 29 locales (old pre-#1392 location-notes UI, app_info
warnings).

Two real tests were flagged as unused because they never ran: Swift
Testing methods missing @Test (NostrProtocolTests.
testAckRoundTripNIP44V2_Delivered, NotificationStreamAssemblerTests.
testAssemblesCompressedLargeFrame). Re-armed both; they pass.

Deliberately kept, now recorded in .periphery.baseline.json: iOS-only
code invisible to the CI macOS scan, C FFI signatures, keep-alive
NWPathMonitor reference, InboundEventKey.eventID (dedup semantics),
wifiBulk capability bit (reserved for Wi-Fi bulk work, used by
BitFoundation package tests), and the String secureClear cluster
(exercised by package tests).

New: .periphery.yml config and an advisory Dead Code CI job (mirrors
the SwiftLint precedent from #1361) that fails on findings not in the
committed baseline.

Verified: full macOS app suite, BitFoundation (119) and BitLogger (13)
package tests green; periphery scan --strict exits clean.

Co-authored-by: jack <jackjackbits@users.noreply.github.com>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

bitchatTests/Services/UnifiedPeerServiceTests.swift

@@ -214,18 +214,6 @@ private final class TestIdentityManager: SecureIdentityStateManagerProtocol {
         socialIdentities[identity.fingerprint] = identity
     }
 
-    func getFavorites() -> Set<String> {
-        favorites
-    }
-
-    func setFavorite(_ fingerprint: String, isFavorite: Bool) {
-        if isFavorite {
-            favorites.insert(fingerprint)
-        } else {
-            favorites.remove(fingerprint)
-        }
-    }
-
     func isFavorite(fingerprint: String) -> Bool {
         favorites.contains(fingerprint)
     }
@@ -266,8 +254,6 @@ private final class TestIdentityManager: SecureIdentityStateManagerProtocol {
 
     func registerEphemeralSession(peerID: PeerID, handshakeState: HandshakeState) {}
 
-    func updateHandshakeState(peerID: PeerID, state: HandshakeState) {}
-
     func clearAllIdentityData() {
         socialIdentities.removeAll()
         favorites.removeAll()
@@ -308,10 +294,6 @@ private final class TestIdentityManager: SecureIdentityStateManagerProtocol {
         false
     }
 
-    func effectiveTrustLevel(for fingerprint: String) -> TrustLevel {
-        verified.contains(fingerprint) ? .verified : .unknown
-    }
-
     func lastVouchBatchSent(to fingerprint: String) -> Date? {
         nil
     }